From: J Travis (dagobert@ix.netcom.com)
Date: Tue Aug 05 2003 - 07:31:09 PDT
Antonio,
one thing I forgot to ask- when you crank the engine, does it turn over
at normal speed and just not fire, or does it seem to drag so slowly
that it just isn't going fast enough to catch?
J Travis
David Cole wrote:
> You don't have a voltage problem in the system if you can maintain
> 23.4 when cranking!
>
> There is something else that is wrong. There should be a resistor in
> the distributor I believe (there is one in my M51 5 ton dump) that
> limits the current through the coil. In order for the coil and points
> to work properly current must flow through the coil. Check for
> voltage across the coil when the points are shut, you should have
> something like 3-6 volts. The resistor drops the other voltage when
> current is flowing. Then check for voltage when the points are open.
> You should have zero volts across the coil. Of course the ignition
> has to be on when you do this.
>
> If you don't have 3-6 volts then something is out of wack. Perhaps
> you have a bad connection, an open resistor, or really bad points.
> (It doesn't take much corrosion and dirt on points to make them
> worthless) When the points are closed and the ignition is on, you
> should have no more than a fraction of a volt across the points when
> the current is flowing. (like .1- .3 volts) Any more and you need to
> replace the points.
>
> If you have a decent voltmeter, you can find this problem pretty quickly.
>
> Dave
>
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
> On Tue, 5 Aug 2003 13:45:28 +0200, Antonio Regazzoni (Home)
> <antonio.regazzoni@bluewin.ch> wrote:
>
>> Hi list,
>>
>> I think I'm having the same problem as Rich Sherman. I have a M151A2
>> with two good batteries. They are not charged 100% but I can measure
>> 12.6 V on both of them. This makes 25.2 V total. When I crank the
>> engine I can measure 23.4 V. The engine doesn't start !
>>
>> I cannot believe that the ignition system is so sensitive that with
>> 23.4 V doesn't give enough sparks to start the engine. I'm thinking
>> that the problem could be in a big voltage drop between the batteries
>> and the ignition coil, or a bad coil or capacitor.
>>
>> I will measure the input voltage at the coil and check all the
>> electrical connections from the battery to the ignition system.
>>
>> Any comments ?
>>
>> Thanks,
>>
>> Antonio Regazzoni,
>> 1944 MB
>> 1974 M151A2
>> 1975 Pinzgauer
>>
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>
>
>
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